/* 3 弹窗拖拽 v-dialogDrag: */
export default {
	bind(el) {
		const dialogHeaderEl = el.querySelector(".el-dialog__header");
		const dragDom = el.querySelector(".el-dialog");
		dialogHeaderEl.style.cursor = "move";

		// 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
		const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null);

		dialogHeaderEl.onmousedown = e => {
			// 鼠标按下，计算当前元素距离可视区的距离
			const disX = e.clientX - dialogHeaderEl.offsetLeft;
			const disY = e.clientY - dialogHeaderEl.offsetTop;

			// 获取到的值带px 正则匹配替换
			let styL, styT;

			// 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
			if (sty.left.includes("%")) {
				styL = +document.body.clientWidth * (+sty.left.replace(/%/g, "") / 100);
				styT = +document.body.clientHeight * (+sty.top.replace(/%/g, "") / 100);
			} else {
				styL = +sty.left.replace(/\px/g, "");
				styT = +sty.top.replace(/\px/g, "");
			}

			document.onmousemove = function (e) {
				// 通过事件委托，计算移动的距离
				const l = e.clientX - disX;
				const t = e.clientY - disY;

				// 移动当前元素
				dragDom.style.left = `${l + styL}px`;
				dragDom.style.top = `${t + styT}px`;

				// 将此时的位置传出去
				// binding.value({x:e.pageX,y:e.pageY})
			};

			document.onmouseup = function () {
				document.onmousemove = null;
				document.onmouseup = null;
			};
		};
	},
};
